/// \file
/// \ingroup tutorial_geom
/// Macro allowing to vizualize tessellations from Wavefront's .obj format.
///
/// \image html geom_visualizeWavefrontObj.png width=500px
/// \macro_code
#include <TROOT.h>
#include <TColor.h>
#include <TGeoManager.h>
#include <TGeoTessellated.h>

//______________________________________________________________________________
void teddy_family()
{
   // Input a file in .obj format (https://en.wikipedia.org/wiki/Wavefront_.obj_file)
   // The file should have a single object inside, only vertex and faces information is used

   TString sfile = gROOT->GetTutorialsDir();
   sfile += "/geom/teddy.obj";
   gROOT->GetListOfCanvases()->Delete();
   new TGeoManager("multi_teddy", "Imported from .obj file");
   TGeoMedium *med = new TGeoMedium("MED", 1, new TGeoMaterial());
   TGeoVolume *top = gGeoManager->MakeBox("TOP", med, 50, 50, 50);
   gGeoManager->SetTopVolume(top);

   auto teddy1 = TGeoTessellated::ImportFromObjFormat(sfile.Data());
   teddy1->ResizeCenter(8.);
   auto teddy2 = TGeoTessellated::ImportFromObjFormat(sfile.Data());
   teddy2->ResizeCenter(5.);
   auto teddy3 = TGeoTessellated::ImportFromObjFormat(sfile.Data());
   teddy3->ResizeCenter(10.);

   auto vol1 = new TGeoVolume("teddy1", teddy1, med);
   vol1->SetLineColor(kOrange - 8);
   auto vol2 = new TGeoVolume("teddy2", teddy2, med);
   vol2->SetLineColor(kOrange - 7);
   auto vol3 = new TGeoVolume("teddy3", teddy3, med);
   vol3->SetLineColor(kOrange + 3);

   auto teddy_family = new TGeoVolumeAssembly("teddy_family");
   teddy_family->AddNode(vol1, 1);
   teddy_family->AddNode(vol2, 1, new TGeoTranslation(10, -3, 5));
   teddy_family->AddNode(vol3, 1, new TGeoTranslation(20, 2, 0));

   top->AddNode(teddy_family, 1);

   gGeoManager->CloseGeometry();
   if (!gROOT->IsBatch()) top->Draw("ogl");
}